Among the wind instruments traditionally used by the Luo tribe, there is the oporo, a curved antelope horn (called Kudu) is often decorated with multicolored beads that is played by blowing air through the mouth. It's a very difficult instrument to play and requires much force to blow: in this way it produces different sounds and also pleasant modulations.
The oporo, played by Evance in the photo, is a native of the Kenyan Luo tribe and originally was used to communicate over long distances, especially when celebrating a funeral, a wedding, the "baraza" (a meeting) or during the visit of an important person.
Today it is used during the ceremonies along with niatiti to amplify the emotion and pressing on the rhythm of music, with other traditional instruments, especially to accompany the dances and songs.
Percussion and other musical instruments in Kenya